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Halotrichite

Year of discovery: 1839 (World), 1916 (Japan)

Locality list: 45 localities of halotrichite

• FeAl₂(SO₄)₄,22H₂O
• [Fe(H₂O)₅²⁺][Al(H₂O)₆³⁺]₂[(SO₄)₄]^8-,5H₂O

• Class: Halotrichite group
• Class: Sulfate - Hydrate
• Soluble in: Water, HCl, HNO₃, H₂SO₄

• Fe => Mg: Pickeringite (Series)
• Fe => Mn: Apjohnite (Partial series)
• Fe => Zn: Dietrichite
• Fe => Co: Wupatkiite

• Al => Fe: Bilinite

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Indistinct on {010} (1 plane)
• Hardness: 1.5-2
• Density: 1.9

• System: Monoclinic
• Group: 2, P2
• Lattice: a=20.5, b=24.3, c=6.2, β=101.0